FBIS item (20 Apr 1953): MP Tjugito (OCR) and Suharjo, secretary-general of SABDA, left Jakarta as SOBSI delegates to May Day in Peking. S.K. Trimurti left with the SOBSI delegation and would attend the women's congress in Copenhagen (World Congress of Women). Shows Trimurti's travel in the WIDF circuit.
Het Nieuwsblad voor Sumatra (10 Mar 1954, p.2): in Binjai two committees were formed to organise May Day. The first unites SOBSI, Sarbupri, Gerwis, Pemuda Rakjat and similar groups under a SOBSI chair; the second comprises non-SOBSI organisations such as PGRI and Perbupri and regards itself a branch of the Medan commit
Java-Bode, 18 March 1954, p. 2: short item on two rival committees for 1 May Labour Day in Binjai, East Sumatra: one uniting Sobsi, Sarbupri, Gerwis, Pemuda Rakjat and similar bodies, chaired by Sobsi, and a non-Sobsi committee of PPPRI, OBPI, Perbupri and PGRI.